FW v4.50 is good for my 3750US .
Here is changelog:
Updates & Downloads
nuvi 37xx (GCD File) software version 4.70
as of November 17, 2011
Changes made from version 4.60 to 4.70:
Fixed an error that caused the device to shutdown when using myTrends.
Added support for a new OEM mount.
nuvi 37xx (GCD File) software version 4.90
as of May 17, 2012
Changes made from version 4.80 to 4.90:
Fixed a bug that caused the device to reboot at certain locations in Ecuador.
Made a change so that Topo/Recreational and City Navigator Maps cannot be enabled at the same time.
Fixed a bug that caused incorrect letter capitalizations.
Changed the default TTS voice for Dutch language when the locale is Belgium.
Fixed a Czech translation bug.
Fixed some ASR-related bugs.
[Only registered and activated users can see links. ]
Last edited by lolypop000; 22nd May 2012 at 11:32 PM.
Made a change so that Topo/Recreational and City Navigator Maps cannot be enabled at the same time